11-12-2018, 10:37 AM
It looks like the lower tapered boss located on the bottom of the block, and the top "Bridge" bolted down to a couple of head studs. Depending upon which bore was being cut, there would be a couple of holes in the bridge to match the studs in the block. I am assuming that the cutting tool is not in the tool at the moment.
As the handle was turned, the planet gears slowly wound the cutting tool up the bore in the ratio of (small gear divided by big gear) x Thread pitch + many many turns of the handle.
As the handle was turned, the planet gears slowly wound the cutting tool up the bore in the ratio of (small gear divided by big gear) x Thread pitch + many many turns of the handle.